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  1. PO
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    <p>Here's the "walking" method. Less efficient, but it works.</p> <pre><code>var arr = new Array(); for(var n=0; n&lt;25; n++) arr.push(n); var coords = new Array(); var x = 0; var y = 0; for(var i=0; i&lt;arr.length; i++) { if( x &gt; 4 ) { x = 0; y++; } coords[i] = {'x': x, 'y': y}; x++; } // okay, coords contain the coordinates of each item in arr // need to move along the perimeter until a collision, then turn. // start at 0,0 and move east. var dir = 0; // 0=east, 1=south, 2=west, 3=north. var curPos = {'x': 0, 'y': 0}; var resultList = new Array(); for(var x=0; x&lt;arr.length; x++) { // record the current position in results var resultIndex = indexOfCoords(curPos, coords); if(resultIndex &gt; -1) { resultList[x] = arr[resultIndex]; } else { resultList[x] = null; } // move the cursor to a valid position var tempCurPos = movePos(curPos, dir); var outOfBounds = isOutOfBounds(tempCurPos, coords); var itemAtTempPos = arr[indexOfCoords(tempCurPos, coords)]; var posInList = resultList.indexOf( itemAtTempPos ); if(outOfBounds || posInList &gt; -1) { dir++; if(dir &gt; 3) dir=0; curPos = movePos(curPos, dir); } else { curPos = tempCurPos; } } /* int indexOfCoords * * Searches coordList for a match to myCoords. If none is found, returns -1; */ function indexOfCoords(myCoords, coordsList) { for(var i=0; i&lt;coordsList.length; i++) { if(myCoords.x == coordsList[i].x &amp;&amp; myCoords.y == coordsList[i].y) return i; } return -1; } /* obj movePos * * Alters currentPosition by incrementing it 1 in the direction provided. * Valid directions are 0=east, 1=south, 2=west, 3=north * Returns the resulting coords as an object with x, y. */ function movePos(currentPosition, direction) { var newPosition = {'x':currentPosition.x, 'y':currentPosition.y}; if(direction == 0) { newPosition.x++; } else if(direction == 1) { newPosition.y++; } else if(direction == 2) { newPosition.x--; } else if(direction == 3) { newPosition.y--; } return newPosition; } /* bool isOutOfBounds * * Compares the x and y coords of a given position to the min/max coords in coordList. * Returns true if the provided position is outside the boundaries of coordsList. * * NOTE: This is just one, lazy way of doing this. There are others. */ function isOutOfBounds(position, coordsList) { // get min/max var minx=0, miny=0, maxx=0, maxy=0; for(var i=0; i&lt;coordsList.length; i++) { if(coordsList[i].x &gt; maxx) maxx = coordsList[i].x; else if(coordsList[i].x &lt; minx) minx = coordsList[i].x; if(coordsList[i].y &gt; maxy) maxy = coordsList[i].y; else if(coordsList[i].y &lt; miny) miny = coordsList[i].y; } if(position.x &lt; minx || position.x &gt; maxx || position.y &lt; miny || position.y &gt; maxy) return true; else return false; } </code></pre> <p>This will move through the grid in a direction until it hits the bounds or an item already in the results array, then turn clockwise. It's pretty rudimentary, but I think it would do the job. You could reverse it pretty simply.</p> <p>Here's a working example: <a href="http://www.imakewidgets.com/test/walkmatrix.html" rel="nofollow">http://www.imakewidgets.com/test/walkmatrix.html</a></p>
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    1. POjavascript grid help
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    1. USCraig
    1. USCraig
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    1. COI didnt test this but I thank you for adding in your solution to my problem although it doesnt seem complete (missing functions).
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    2. COThe missing functions should be easy to write, but I'll probably add them when I'm on a normal computer. The hard part is the concept, which I _did_ cover.
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      1. USCraig
    3. COAltered the code to include everything. A working example link is also provided.
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